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arXiv 1702.08902cond-mat.str-elcond-mat.dis-nnhep-th
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SYK模型中的幂律非时序关联函数

Power-law out of time order correlation functions in the SYK model

Dmitry Bagrets, Alexander Altland, Alex Kamenev

摘要:

我们计算了Sachdev-Ye-Kitaev(SYK)模型的有限温度配分和关联函数。从最近提出的SYK模型到Liouville量子力学的映射出发,我们通过共形Goldstone模式重新参数化物理时间的精确积分得到了我们的结果。也许,我们分析的最不期望的结果是,在与粒子数成比例的时间尺度上,时间顺序外的关联函数从指数衰减的状态跨越到通用的$t^{-6}$幂律行为。

英文摘要:

We evaluate the finite temperature partition sum and correlation functions of the Sachdev-Ye-Kitaev (SYK) model. Starting from a recently proposed mapping of the SYK model onto Liouville quantum mechanics, we obtain our results by exact integration over conformal Goldstone modes reparameterizing physical time. Perhaps, the least expected result of our analysis is that at time scales proportional to the number of particles the out of time order correlation function crosses over from a regime of exponential decay to a universal $t^{-6}$ power-law behavior.

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